Another day, another backward compatible announcement. With the impressive frequency that Microsoft's adding games to the program, it seems like maybe every new inclusion doesn't warrant its own article. But, a lot of the titles are so high-profile that there's still a community around them. People will want to know. So, here we are.

Today, Valve's Left 4 Dead 2 can be played on Xbox One through Xbox 360 emulation. The 2009 multiplayer zombie shooter still holds up plenty well, and there are still plenty of people playing it on Steam. The Xbox base can probably expect to see a jolt to its numbers now, too.

Last week, Dark Soulsand Assassin's Creed were both added to the program. Yesterday, it was Halo Wars and Soulcalibur II. If Microsoft keeps this pace -- and there's not yet any indication that it'll slow down -- expect to see more of these "what's old is new!" posts with regularity.